Concrete form



mm "M V Ar. 24 1923.,

E. E. PMB/uom CONCRETE FORM Filed June 9, 1922 gli M /w/ ww R fitti titi " tween `the flanges 8.

Patented lthpr. Ed, 192th nnwnnn n. narrator., or satira nnn,` oanrronnra.

` Application filed lune 9,

To all I2li/1,0m t maire/concern Be it known that FnwannF. Partien, afcitiren of` the` United States, residing at Santa Ana,`in the county of Orange and State of California, have invented anewand useful Concrete Forno, of which the followingr" is a specication.

This invention relates to metal forms ol'` the type employed in the casting of hollow poured, cement or concrete structures, andan object ot' `the invention is to rnake provision for contraction of the forni in width and thickness by the siinple expedient of closing1 the sides toward each other, so that the forni can be easily withdrawn lroni i the hole which it occupies.

Another object is to produce contraction in width of the forni by permitting` the edge walls or flanges of one of the form sections `to spring inwardly when the forin sections are relatively moved toward each other.

The accompanying drawings illustrate the invention:

Figure' l is a perspective view of a con- `crete form constructed in accordance with the provisions of this invention. y

Fig. 2 is an enlarged longitudinal section et Figure 1.

F 3 is a plan section on the line indicated b v 3-3 Figure 2.

Fig'. a is a diagrammatic view showing a plurality ol the lioriins, embodyingr the invention, arranged in position between outer forni members preparatory to the pouringl ot the concrete.

'lhere are provided two trough-shaped sheet metal sections assembled with their flanges 7 in opposition, the flanges 7 of the member 5 fitting' inside of the side flanges 8 of the member f. lin other words the flanges 7 are disposedbe- The members 6, when assembled, forni in end elevation the outline of a trapesoid, the flanges flaring and the flanges l slantinaj inwardly toward the flanges .7. Thus,` the fiangfes df the wider section 6 have the distance between the longitudinal `edges closer toejether than thelongitudinal edges of the flanges 7 of the narrower section 5. The sheet metal of which the section 6 is constructed causes the flanges 23 to be resilient so as to normally tend to return to the position shown in broken lines in Figure 3 when 5, 6 of different widths 1922. Serial No. 567,03.

the form is collapsed. y When the form is enpanded the sections 5, G, being moved away from. one another to the position shown in full lines in Figure 3, the flaring,1 flanges 7 engage the fianges 8 and bend said flanges 8 away troni one another. This increases the over-all width of the section 6 from that indicated by the dimension line A in Figure `3 to that indicated by the dimension line B. ln order to effect this the junctions of the flannes `with the mainbody 9 of the section G are curved. as indicated at 10. Preferably the longitudinal.margins ofthe flanges 8 are bentinwardly as `indicated at ll so as to el lectcontact of only the longitudinal edges of the flanges 8 with the outer faces of the flanges 7, thus preventing' leakage of liquid conc-rete into the interior of the mold `and minimizing4 friction when the sections are relatively `rnoved.

any suitable means may be provided for contractingr and expanding the form and the invention is not limited to the means shown. These means are constructed as followsf wo pairs of toggles are provided, an upper and a lower pair. and each toggle comprises links 12, 13. The links 1.2 are pivoted at 14, to ears secured by rivets 16 to the inner face of the section G. The links 13 are pivoted at 17 to ears 18 secured to the inner face of the section 5 by rivets 19. The links 13 are pivoted at 20 to the links la, and are provided with handles 21 which entend at right anpfles to the links 13 above the links 12. rlhe handles 21 can be grasped by the operator to manipulate the toggles, and said handles also serve as stops to liinit downward rnotion of the togn'les. rlhe axis of the pivot of each toggle is below a line passing through the axes of the associated pivots 141i 17, so that when the tongles are extended `they cannot be collapsed by pressure against the outer faces of the sections 5, (S. ln order to retract the toggles it is necessary to raise the handles 21.

The section 5 may be stifened by ribs 2Q which.i preferably extend transversely on the inner face of said section from the edge of one flange 7 to the edge ofthe other flange 7, thus the flanges are relatively unyielding' when they press against the flanges 8.

` rlhe section 6 may also be stili-'cned in part by ribs 23 which are shorterl than the distance between the curved portions l0 so that said portions can readily yield when the flanges are spread by pressure of the flanges 7.

The form is used in the following Inanner:V Y

The outer forms, indicated at 24 in Fig. 4, having been first constructed in a manner well understood in the art pertaining to reenforeed concrete construction, the inner form described above, invits expanded condition, will be inserted between the outer 'form nieinbers and other similarly yeonstrubtedfinner or'nls willrbe inserted inthe Figure 3. This, as is clearly seen, permits the -langes 8 to spring inwardly, thus redneing the width of the see-tion 6 to the dimension indicated at A in Figure 3. The form may then be easily withdrawn from the cavity formed by it in the wall being east.

I claim:

In a concrete form, the combination of trough-shaped sheet inetal sections of different widths assembled with their flanges in I opposition, the flanges of the narrower seetion flaring and being disposed between the langes of the wider section, the anges of' the wider section having their longitudinal edges eloser together than the longitudinal edges of the flanges of the narrower see-tion when the sections are in collapsed position` andretraetable means to hold the sections against pressure tending to collapse them.

"Signed 'atl Los Angeles, California this 31st day of May'l1922`.

EDVARD E. PATMOR. Vitnesses GEORGE H. HILES, L. BELLEy VVEAvnR. 

